(KCEN) -- If you can't get by with your morning cup of coffee, you aren't alone.
A new survey finds many professionals feel more productive at work when they drink coffee.
Who tops the list for of workers who drink the most coffee?
Food preparation and service workers.
They're followed by scientists, sales reps, marketing and public relations professionals and nurses.
Dunkin Donuts and Careerbuilder commissioned the survey to tie in with National Coffee Day, which is this Saturday.